August is one of the cooler months of the year in Port Denison, with average highs near 19.4°C and lows around 11.8°C (mean 15.6°C). It is a relatively wet time of year, averaging 64 mm of rainfall and 73% relative humidity across the period.
August is one of the cooler months of the year in Port Denison. Across 45 years of records, the warmest August in Port Denison was 2014 — when the month averaged 18.2°C — while the coldest was 1986 at 13.6°C. Typical August days reach 19.4°C with nights near 11.8°C. The long-term trend is warming, about 0.3°C per decade.
August is a relatively wet time of year in Port Denison, averaging 64 mm of rainfall. The wettest August on record was 1992 with 152 mm, while the driest was 2008 at 17 mm.
Relative humidity in Port Denison during August averages 73%. The most humid August was 2009 at 79%, and the least humid was 2020 at 66%.
August receives about 4.1 kWh/m²/day of solar energy in Port Denison. The sunniest Augusts were 1994 and 2019 at 4.5 kWh/m²/day, and the cloudiest was 1998 at 3.7.
Average wind speed in Port Denison during August is 3.8 m/s. The windiest August was 2022 at 4.5 m/s, while the calmest were 1998 and 2012 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.2°C | 15.3°C | 15.3°C | 16.0°C | 16.3°C | +1.1°C |
| Avg High | 18.9°C | 18.8°C | 19.2°C | 19.9°C | 20.3°C | +1.4°C |
| Avg Low | 11.5°C | 11.7°C | 11.4°C | 12.0°C | 12.3°C | +0.8°C |
| Avg Rain | 62 mm | 72 mm | 64 mm | 59 mm | 59 mm | -3 mm |
August temperatures in Port Denison have risen by about 0.9°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 5.3°C (1986) to a record high of 30.1°C (2023).
Rainfall in August is a relatively wet time of year, averaging 64 mm, with a wettest year of 152 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A quieter season to visit Port Denison
If your dates are flexible, the more temperate months of November and April tend to be the most comfortable for visiting Port Denison. That said, August — with days averaging 19.4°C and nights around 11.8°C (mean 15.6°C) and moderate rainfall (64 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.5°C | 15.7°C | 11.9°C | 23.7°C | 8.2°C | 95 mm | 72% | 4.2 m/s | 4.1 |
| 2024 | 19.7°C | 16.7°C | 13.6°C | 23.1°C | 8.7°C | 52 mm | 73% | 3.8 m/s | 4 |
| 2023 | 22.3°C | 17.3°C | 12.2°C | 30.1°C | 7.7°C | 31 mm | 70% | 3.3 m/s | 4.3 |
| 2022 | 19.4°C | 15.6°C | 11.7°C | 22.9°C | 8.7°C | 111 mm | 70% | 4.5 m/s | 4.2 |
| 2021 | 20.2°C | 16.0°C | 11.9°C | 24.5°C | 8.3°C | 25 mm | 70% | 3.9 m/s | 4.3 |
| 2020 | 20.5°C | 16.6°C | 12.7°C | 27.3°C | 9.7°C | 42 mm | 66% | 4.3 m/s | 4 |
| 2019 | 20.6°C | 16.1°C | 11.5°C | 27.5°C | 8.1°C | 44 mm | 68% | 3.9 m/s | 4.5 |
| 2018 | 18.5°C | 15.0°C | 11.6°C | 24.3°C | 8.2°C | 62 mm | 73% | 4.2 m/s | 4.1 |
| 2017 | 19.5°C | 15.7°C | 11.8°C | 24.4°C | 7.1°C | 77 mm | 73% | 3.8 m/s | 4.1 |
| 2016 | 17.9°C | 14.3°C | 10.8°C | 21.5°C | 7.0°C | 53 mm | 74% | 3.7 m/s | 4.1 |
| 2015 | 19.6°C | 15.9°C | 12.2°C | 24.9°C | 7.9°C | 44 mm | 73% | 3.8 m/s | 4.1 |
| 2014 🔥 | 22.6°C | 18.2°C | 13.7°C | 26.8°C | 9.2°C | 37 mm | 68% | 3.3 m/s | 4.2 |
| 2013 | 20.6°C | 17.1°C | 13.5°C | 24.6°C | 10.4°C | 86 mm | 73% | 3.7 m/s | 3.9 |
| 2012 | 20.1°C | 15.9°C | 11.8°C | 23.8°C | 8.9°C | 36 mm | 73% | 3.2 m/s | 4.2 |
| 2011 | 19.8°C | 16.1°C | 12.4°C | 23.1°C | 8.1°C | 76 mm | 75% | 3.7 m/s | 4.3 |
| 2010 | 20.0°C | 15.4°C | 10.9°C | 23.5°C | 8.2°C | 79 mm | 68% | 3.6 m/s | 4.2 |
| 2009 | 19.4°C | 16.0°C | 12.7°C | 22.6°C | 8.2°C | 72 mm | 79% | 3.6 m/s | 4.1 |
| 2008 | 19.5°C | 14.7°C | 9.9°C | 22.5°C | 7.6°C | 17 mm | 67% | 4 m/s | 4.4 |
| 2007 | 19.9°C | 16.1°C | 12.3°C | 24.0°C | 8.0°C | 46 mm | 72% | 3.7 m/s | 4 |
| 2006 | 21.2°C | 17.3°C | 13.4°C | 25.8°C | 8.8°C | 49 mm | 73% | 3.7 m/s | 4.1 |
| 2005 | 18.9°C | 15.0°C | 11.0°C | 22.7°C | 7.1°C | 85 mm | 73% | 4 m/s | 4.1 |
| 2004 | 18.1°C | 14.6°C | 11.2°C | 21.6°C | 6.5°C | 74 mm | 72% | 4.1 m/s | 4.2 |
| 2003 | 18.4°C | 14.9°C | 11.4°C | 21.2°C | 8.4°C | 109 mm | 75% | 3.6 m/s | 3.9 |
| 2002 | 19.0°C | 15.0°C | 11.0°C | 22.9°C | 7.1°C | 61 mm | 71% | 3.8 m/s | 4.2 |
| 2001 | 19.0°C | 14.8°C | 10.6°C | 22.3°C | 7.4°C | 44 mm | 73% | 3.6 m/s | 4.3 |
| 2000 | 18.5°C | 14.7°C | 10.8°C | 22.6°C | 7.1°C | 80 mm | 73% | 4 m/s | 4.2 |
| 1999 | 18.8°C | 15.0°C | 11.3°C | 22.2°C | 8.0°C | 48 mm | 76% | 4.1 m/s | 4.3 |
| 1998 | 19.5°C | 16.2°C | 13.0°C | 22.9°C | 8.9°C | 43 mm | 78% | 3.2 m/s | 3.7 |
| 1997 | 19.0°C | 15.1°C | 11.3°C | 23.5°C | 7.5°C | 91 mm | 73% | 4 m/s | 4.4 |
| 1996 | 18.2°C | 15.1°C | 12.0°C | 22.5°C | 7.8°C | 102 mm | 76% | 3.5 m/s | 3.9 |
| 1995 | 19.4°C | 15.5°C | 11.6°C | 23.2°C | 8.8°C | 23 mm | 74% | 3.8 m/s | 4.3 |
| 1994 | 20.7°C | 16.4°C | 12.0°C | 24.7°C | 9.0°C | 81 mm | 72% | 3.9 m/s | 4.5 |
| 1993 | 18.3°C | 14.6°C | 10.9°C | 22.4°C | 6.5°C | 85 mm | 75% | 3.7 m/s | 4.3 |
| 1992 🌧️ | 17.8°C | 15.0°C | 12.1°C | 23.2°C | 6.4°C | 152 mm | 74% | 4.3 m/s | 3.8 |
| 1991 | 19.0°C | 15.5°C | 11.9°C | 23.0°C | 8.3°C | 39 mm | 75% | 4.2 m/s | 4.1 |
| 1990 | 17.6°C | 14.4°C | 11.1°C | 20.7°C | 7.2°C | 57 mm | 73% | 4 m/s | 3.8 |
| 1989 | 19.7°C | 15.2°C | 10.8°C | 24.0°C | 7.3°C | 29 mm | 69% | 3.6 m/s | 4.3 |
| 1988 | 18.8°C | 15.4°C | 12.0°C | 23.9°C | 8.7°C | 71 mm | 76% | 4 m/s | 3.9 |
| 1987 | 19.9°C | 15.3°C | 10.7°C | 24.2°C | 6.4°C | 71 mm | 70% | 3.9 m/s | 4.1 |
| 1986 ❄️ | 17.0°C | 13.6°C | 10.2°C | 21.3°C | 5.3°C | 64 mm | 77% | 3.4 m/s | 4.2 |
| 1985 | 18.7°C | 15.1°C | 11.6°C | 24.3°C | 6.7°C | 68 mm | 72% | 4 m/s | 4 |
| 1984 | 18.6°C | 15.1°C | 11.6°C | 22.0°C | 7.0°C | 76 mm | 74% | 3.6 m/s | 4.1 |
| 1983 | 19.5°C | 16.1°C | 12.6°C | 22.3°C | 7.5°C | 65 mm | 76% | 3.7 m/s | — |
| 1982 | 20.0°C | 16.0°C | 12.0°C | 24.4°C | 7.9°C | 54 mm | 76% | 3.6 m/s | — |
| 1981 | 17.8°C | 14.7°C | 11.7°C | 22.6°C | 7.3°C | 62 mm | 76% | 3.9 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 19.4°C with lows near 11.8°C (mean 15.6°C), based on 45 years of NASA POWER data.
August averages 64 mm of rainfall in Port Denison, a relatively wet time of year. The wettest on record was 152 mm in 1992.
The hottest August reached 30.1°C in 2023. The coldest dipped to 5.3°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.9°C. Daytime highs moved from 18.9°C to 20.2°C and overnight lows from 11.9°C to 12.3°C over the same span.
August is one of the cooler months of the year in Port Denison and a relatively wet time of year, so plan for around 19.4°C daytime highs and 11.8°C at night.
Not quite — August is the 2nd coolest month in Port Denison, averaging 15.6°C.
For August in Port Denison, pack light layers you can adjust through the day, with typical highs of 19.4°C and lows of 11.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 73% — moderately humid.
Average wind speed in August is 3.8 m/s. The windiest August on record averaged 4.5 m/s (2022).
The wettest August on record was 1992 with 152 mm. On average, August sees 64 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Port Denison behaves each August, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for August specifically, along with year-by-year records and how the month has changed over the decades.
